If your machine really is CHECKING for updates rather than downloading one the problem might not be Windows 10 related, but perhaps a communication (WiFi) failure. Shutting down completely and restarting might solve it. But it might be that although it is saying "checking" it is in reality downloading Windows 10, which might take several hours if your internet connection and/or Wifi links aren't superfast.
You should also check the Microsoft site and also the site of your laptop's manufacturer to ensure that it is actually compatible with Windows 10. (Sony have recently issued a warning that some of their recent machines cannot currently run Windows 10).
But on the other hand why bother? I've had a really awful experience going from 7 to 10 which has caused immense worry, frustration and days of wasted time. That's with a high-spec fully compatible machine only a year old. It's still not fully right, but at least it's usable and I've manged to re-install all my Apps. However, while Windows 10 is a huge improvement compared to Windows 8, it really is no better - and in some ways it's worse - than Windows 7. My advice would be to stick with Windows 7 for now. Wait at least until Microsoft's first major update to 10 which is promised for November, or even till shortly before the July 2016 cut off date for the free upgrade.